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gcode: Add ability to register a "mux" command 

It's common to add commands that dispatch to a particular object
instance depending on the value of a command parameter.  (For example,
the command "SET_SERVO SERVO=xyz" wants to be handled by the
particular "xyz" servo instance.)  Add a register_mux_command() helper
to gcode.py make it easier to do this.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-05-20 12:33:43 -04:00
parent 6869e7d1ec
commit abe79056c9
1 changed files with 23 additions and 0 deletions
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23
klippy/gcode.py
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@ -31,6 +31,7 @@ class GCodeParser:
self.is_printer_ready = False
self.base_gcode_handlers = self.gcode_handlers = {}
self.ready_gcode_handlers = {}
self.mux_commands = {}
self.gcode_help = {}
for cmd in self.all_handlers:
func = getattr(self, 'cmd_' + cmd)
@ -69,6 +70,19 @@ class GCodeParser:
self.base_gcode_handlers[cmd] = func
if desc is not None:
self.gcode_help[cmd] = desc
def register_mux_command(self, cmd, key, value, func, desc=None):
prev = self.mux_commands.get(cmd)
if prev is None:
self.register_command(cmd, self.cmd_mux, desc=desc)
self.mux_commands[cmd] = prev = (key, {})
prev_key, prev_values = prev
if prev_key != key:
raise error("mux command %s %s %s may have only one key (%s)" % (
cmd, key, value, prev_key))
if value in prev_values:
raise error("mux command %s %s %s already registered (%s)" % (
cmd, key, value))
prev_values[value] = func
def set_move_transform(self, transform):
if self.move_transform is not None:
raise self.printer.config_error(
@ -380,6 +394,15 @@ class GCodeParser:
self.extruder = e
self.reset_last_position()
self.run_script(self.extruder.get_activate_gcode(True))
def cmd_mux(self, params):
key, values = self.mux_commands[params['#command']]
if None in values:
key_param = self.get_str(key, params, None)
else:
key_param = self.get_str(key, params)
if key_param not in values:
raise error("The value '%s' is not valid for %s" % (key_param, key))
values[key_param](params)
all_handlers = [
'G1', 'G4', 'G28', 'M18', 'M400',
'G20', 'M82', 'M83', 'G90', 'G91', 'G92', 'M114', 'M220', 'M221',